The Palestine Democratic Union (Al-Ittihad al-Dimuqrati al-Filastini, generally known as FIDA) is a small Palestinian political party, formed in 1990 through a split in the Democratic Front for the Liberation of Palestine, bringing with it most of the DFLP structure in the West Bank. FIDA took a more moderate stance than the main DFLP, and has tried to establish itself as a left-wing democratic alternative in Palestinian politics.

The youth wing of FIDA is known as Independence Youth Union; there are also workers' and women's groups. FIDA has no armed wing, in contrast to the DFLP and several other Palestinian organizations.

The slogan of FIDA is "freedom, independence, return, democracy and socialism." It presents itself as a progressive, secular, and democratic socialist party, and espouses the Marxist vocabulary of "scientific socialism."

It advocates a two-state solution based on the borders of 1967 and with East Jerusalem as the capital of an independent Palestinian state. A prominent FIDA leader, Mamduh Nofal, in 2002 signed an appeal to stop suicide bombings.

Palestinian Democratic Union "FIDA" is a Palestinian political party that constitutes a member faction of PLO, which is the sole and the legitimate representative of the Palestinian People in liberation, return establishment of the democratic independent sate and attainment of comprehensive peace in the region. It is also a social democratic party of a progressive vision for the structuring of a Palestinian society and the basis of democracy, social justice, equality and it open the road towards socialism.